// Copy Buf to application buffer USBD_CDC_SetRxBuffer(&hUsbDeviceFS, &RxBuffer[0]); USBD_CDC_ReceivePacket(&hUsbDeviceFS); return (USBD_OK);
Analysis and Implementation of the STMicroelectronics Virtual COM Port Driver for Embedded System Communication Author: [Your Name] Affiliation: [Your Institution/Organization] Date: [Current Date] Abstract The STMicroelectronics Virtual COM Port (VCP) driver is a critical software component enabling USB-based serial communication between a host computer and STM32 microcontrollers (e.g., STM32F4xx, STM32L4xx series) that feature USB hardware. This paper examines the architecture, installation, and operational principles of the STM32 VCP driver, focusing on its role in emulating a standard RS-232 serial port over USB. We discuss the driver’s integration with USB communication device class (CDC), its behavior across Windows, Linux, and macOS platforms, and performance considerations. Practical implementation steps and debugging techniques are provided, along with a comparison to direct UART communication. Results show that the VCP driver offers a convenient, high-speed, plug-and-play interface for firmware development and real-time data logging. stmicroelectronics virtual com port driver
| Baud Rate (set on host) | Effective Throughput (kB/s) | Notes | |-------------------------|-----------------------------|-------| | 115200 | ~12.5 | USB bulk limited by host serial layer emulation | | 921600 | ~65 | Higher setting improves throughput | | 1000000 (1M) | ~85 | Near USB FS max for single bulk endpoint | static int8_t CDC_Receive_FS(uint8_t* Buf
STM32, Virtual COM Port, USB CDC, Embedded Systems, Serial Communication, Device Driver 1. Introduction Embedded systems frequently require communication with a host PC for debugging, configuration, or data transfer. Traditional RS-232 serial ports are increasingly absent from modern computers. STMicroelectronics addresses this gap by providing a Virtual COM Port driver that allows an STM32 microcontroller with USB peripheral to appear as a standard serial port on the host OS. Virtual COM Port
static int8_t CDC_Receive_FS(uint8_t* Buf, uint32_t *Len)